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OLCT 60
FIXED POINTGAS MONITOR
USER MANUAL
5.6 Checking the line current
Figure 28: Checking the current generator of the detector
Proceed as follows:
1. Check the detector for proper power supply (+24V between terminal 2 and 3).
2. Switch the multimeter over to current measurement (mA range).
3. Make sure to inhibit the controller to avoid any false alarm. Disconnect the signal wire (terminal
1, Pos. B). Connect the «COM» terminal of the multimeter (Pos. D) to terminal 2 (0 V) of the
detector (Pos. A).
4. Connect the «mA» terminal of the multimeter (Pos. D) to terminal 1 (signal) of the detector (Pos. A).
5. The current must be 4 mA (Pos. C) when zero grade air is applied on the sensor and 20 mA
when applying span gas of concentration equal to the full scale.
6. Once testing is completed, connect back the signal wire to terminal 1 (Pos. B).
34
+ 24 VDC
0 V
Signal
NPO60GB
Revision F.2
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